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Cho tam giác ABC trung tuyến AM, trên tia đối của tia MA lấy điểm D sao cho MD=MA, nối B với E. a, Chứng minh rằng CE = AC và BE // AC. b, Gọi D là trung điểm của AB, trên tia đối của tia DE lấy điểm F sao cho DF = DE. Chứng minh rằng A là trung điểm của CF. c, Hãy so sánh độ lớn hai góc BAM và MAC Mấy bn giỏi toán ơi, giúp mk với Bn quangcuong347, phiduc2007thcsdt,... giúp mk với!!!!!!
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